Background
With the exception of installations at high altitudes, the sun's maximum irradiation power remains constant at around 1,000 W/m². However, according to studies conducted by Mike Zehner, what are known as cloud effects can lead to a short-term increase in solar irradiation on PV modules, which is caused by reflection of solar irradiation from cumulus clouds. According to the study, this effect would increase the irradiation values to up to 25% over the usual 1,000 W/m² (i.e., to up to 1,250 W/m²).